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gtin-validator's Issues

UPC-E support

I want to use this library. I need UPC-E.
UPC-E is a 0-Suppressed UPC (GTIN-12).

Would you like to add support for it?
I can prepare a pull request, to help you.

Valid EAN-13 (based on other online checkers) returns as not valid

Tried this:

Real\Validator\Gtin\Factory::isValid('0231566199093')

and I get false. This should be a valid EAN-13 and a GTIN-13, derived from a UPC-12 with its "0" prefix and recalculated check digit.

I expected that to be valid. Should it not be valid? Is there some group range in this GTIN-13 that makes it invalid?

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